Shell and hermit crab relationship

Hermit Crab and Great Triton Relationship. by Sarah Hibbs on Prezi

shell and hermit crab relationship

PDF | Symbiosis, according to its initial meaning, refers to the biological of hermit crab related to shell resource utilization, and (5) report. Four hermit crab species, occupying shells of nine gastropod species, were found in symbiosis with the sea anemone Calliactis parasitica. MARINE ECOLOGY PROGRESS SERIES Vol. –, Published November 16 Mar Ecol Prog Ser Relationships between a hermit crab and its.

A caveat to the paradigm of the hermit crab shell Study site.

Detailed then is the asynchronous accessibility of these resour- maps 1 m resolution of seagrass areal extent were ces; some portion of the resource is immediately avail- obtained during the spring and fall of S94 and able empty shellswhile other portions are likely to F94 and S95 and F A full description of the become available at a future time living gastropods study site and the mapping technique used can be and shells occupied by other hermit crabs.

Shells of 6 If a relationship exists between the spatial abun- gastropod species Anachis translirata Rav. A detailed description shellsespecially if the availability of empty shells is of shell use patterns and life history characteristics of transitory. Thus, one might predict that hermit crab the hermit crabs and gastropods at this study site can distribution patterns reflect the distribution patterns be found in Robbins On each mapping date, 63 haphazardly tionally, the abundance patterns displayed by an selected 1 m2 areas within monospecific Halodule organism or its resources may also reflect habitat wrightii patches were georeferenced and sampled by features such as seagrass density sensu Irlandi et al.

Both hermit crabs and live gastropods may 30 cm into the substratum. These seagrass descriptors eration of underlying habitat characteristics may be were chosen to represent the horizontal and vertical incomplete.

Spatial patterns of a resource and its user Hermit crabs, living gastropods and empty gastro- relationships. Because these comparisons were based pod shells were collected using a 1 m2 throw trap on interpolated data, no statistical significance can be placed immediately adjacent to the georeferenced sea- attached to any observed correlations Davis Throw traps were constructed using a 10 cm tall, 16 g metal flange and a 5 cm diameter PVC float attached to 2 mm mesh, 1 m in height.

Few ered for analysis. The relationships Shoot density m—2 among abundances of different shell occupants by date were examined using Spearman Rank Corre- lation Zar No species level analyses were performed. To accomplish this, we assigned each of the 63 sampling Canopy height cm locations, based on raw values, to 1 of 5 categories for 15 each of the shell occupants and the seagrass descrip- tors: These data were then 10 interpolated using an inverse distance weighted inter- polation technique Koerper For each date, abundance maps based on P.

Cross-correlation ana- Date lysis was used to examine the spatial arrangement of Fig. S94, F94 variation of variable densities and their associated and S95, F The relation- ships between P. Overall, the relationship between empty gas- 6 tropod shells and gastropods was stronger during F94 and F95, when both hermit crab densities and empty 4 Table 1. Correlation coefficients r and significance values 2 p based on Spearman Rank correlations among Pagurus maclaughlinae hermitlive gastropods live and empty gastropod shells empty numbers m—2 by date S94, F94 and 0 S95, F Dates within displayed a weaker this season S95 correlation between hermit crabs and live gastropods than Although 3 of the 4 sea- sonal correlations between empty shells and P.

Spearman Rank Correlation values are reported with p-values listed immediately A pairwise comparison of sea- below. In general, at the scale of S95 Shoots —0. Spatial patterns of a resource and its user Table 3. Unlike simple correlations that Seagrass descriptors did not appear to explain the may be influenced by a large deviation within a small region of the sampled area, this matrix reflects the spatial arrange- patterns of abundance of hermit crabs or their re- ment of the relationships among the variables.

Values are r2 sources over the duration of our study. Specifically, our correlations for each pairwise comparison. Because correla- results indicate that neither mean short-shoot density tions are based on interpolated values, no statistical signifi- nor mean maximum canopy height were strong predic- cance can be attached tors of abundance patterns of hermit crabs when com- pared over this scale.

There were also no consistent Gastropod Empty Shoot Canopy relationships between seagrass and categories of shell S94 Hermit 0.

shell and hermit crab relationship

Overall, the correlative information F95 Hermit 0. The relationship between hermit shells were at lower densities than those recorded in Table 4.

Relationship between ag- either S94 or S95 Table 3. Thus, the majority of locations with highest densities of hermit crabs corresponded to loca- 2 SD above mean tions with the densest aggregations of live gastropods.

S94 Live 0 16 41 43 84 The relationship between hermit crab and empty Empty 14 20 25 41 66 shells was less strong Table 4. Notably hermit crabs F94 Live 0 1 49 41 90 Empty 0 0 0 0 0 at densities 2 SD above their mean were never found in S95 Live 0 98 1 1 2 areas with gastropod densities 1 SD below their mean Empty 0 24 73 3 76 and only during S94 were these hermit crab aggrega- F95 Live 0 2 14 84 98 tions recorded associated with empty shell aggrega- Empty 0 6 53 41 94 tions 1 SD below their mean.

Additionally, the clus- hermit crabs and live gastropods. Although not stud- with the highest live gastropod densities. However, this influence was likely not im- may be evolutionarily beneficial if the rate of decline portant in the seagrass system studied here because in shell integrity upon the death of the gastropod of the opportunistic feeding behavior displayed by P.

Relationship Between Hermit Crabs & Sea Anemones

Shell resource utilization patterns One of the most common cases of symbiosis in marine varied among hermit crabs, with Dardanus species utiliz- ecosystems is between cnidarians and hermit crabs ing a wide variety of shells. The size structure of hermit Decapoda: Anomura ; over species of cnidarians have crab populations also affected shell resource utilization, been reported in such associations Williams and McDermott with small-sized individuals inhabiting a larger variety of Actiniariathough, are the shells.

The mass of C. The examined biometric relation- development of this symbiosis depends strongly on the ships suggested that small-sized crabs carry, proportionally availability of gastropod shells, which provide both refuge for to their weight, heavier shells and increased anemone hermit crabs and substratum for the settlement of sea anem- biomass than larger ones. Exceptions to the above patterns ones Conover ; Brooks The sea anemone Communicated by Martin Thiel.

The great importance of the symbiosis is manifested A. Chintiroglou by the behavior of the hermit crabs. Under increased levels Department of Zoology, School of Biology, Aristotle University, 41 Thessaloniki, Greece of predation, they inhabit shells with more sea anemones e-mail: However, when being starved, Crete and islands, in the southern Aegean Sea hermit crabs may prey on the anemones attached on their Fig.

Eight randomly selected stations were located in shell Imafuku et al. The available information refers T7 40—60 m, and T8 75—95 m. Nine randomly selected mainly to the diversity of the associated epibiotic organisms stations were located in the southern Aegean Sea, where Stachowitsch ; Williams and McDermottand the substratum was either soft, i. A number of rocks and maerl beds S1 20 m, M1 35 m, M4 25 m, C1 studies manifest different shell resource utilization patterns 30 m, C2 20 m, and C4 35 m.

Intrinsic shell properties e. Reese ; Caruso and Chemelloinfluencing The latter method was used only at two stations in Ther- also the placement of sea anemones on the shell Ross and maikos Gulf T7, T8.

shell and hermit crab relationship

The collected samples were stored Boletzky ; Brooks For example, a trend symbiosis. Considering sea anemone utilization, species, and 3 number of hermit crab species utilizing a very few data exist. A single relevant study has been per- specific gastropod shell. However, this study Non-metric multidimensional scaling ordination nMDS included a local population of a single hermit crab species; via Bray-Curtis distances was used to visualize changes in thus, generalization of such patterns cannot be done.

This was accomplished by providing compre- between the various types of substratum i.

shell and hermit crab relationship

Since only sea- the involved species. Multivariate analyses were performed using the Primer package Clarke and Gorley The population structure of each hermit crab species that Materials and methods hosted sea anemones was analyzed by constructing size- frequency distributions based on the weight of hermit Sampling was carried out at Thermaikos Gulf, crabs.

These data were used to assess shell utilization ofandin the northern Aegean Sea, and at each hermit crab species in relation to its size.

shell and hermit crab relationship

Among these, only indi- cies two-factor unbalanced design. The Bonferroni test viduals The species crab species found, applying linear regression analysis Paguristes eremita and Pagurus excavatus were mainly using the power model, i. Dardanus calidus was the largest species with respect From these species, B. Similar results appeared considering constituted by medium and large size classes, utilized also the diversity of shells utilized by each hermit crab three shell species with the larger individuals mostly Fig.

Finally, in the case performing the same analyses using data only from sea- of Pagurus excavatus, the almost equally represented size grass meadows, a clear separation between the northern classes of its population occupied mainly B.

Relationship Between Hermit Crabs & Sea Anemones | Animals -

Same analyses performed exclusively on data from seagrass meadows c, d Fig. Small, medium, to 5, 11, and 16 g, respectively, for P. Bars represent standard deviation. All hermit crabs with sea anemones were pooled, regardless of sampling location and hermit crab size Fig. The smallest species examined relationships followed negative allometry Paguristes eremita is an exception of the above pattern since Table 2 ; thus, the relative increment of the hermit crab the examined relationships were isometric Table 2.

Pagurus Hermit crab—Calliactis parasitica symbiosis types: This case of mutualistic sym- the shells of other 33 gastropod species.